MICP加固砂土方法对比研究

张锦程; 李俊; 肖鹏; 刘汉龙; 吴焕然

doi:10.11835/j.issn.2096-6717.2022.125

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MICP加固砂土方法对比研究

土木工程 | 更新时间：2023-11-21

- MICP加固砂土方法对比研究
- Comparative study on MICP-treatment schemes for sands
- 土木与环境工程学报 2023年45卷第6期页码：151-157
- 作者机构：
  
  1.重庆市地质灾害防治中心，重庆 400015
  2.重庆大学，土木工程学院
  3.重庆大学，山地城镇建设与新技术教育部重点实验室
  4.重庆铁路投资集团有限公司，重庆 400023
- 作者简介：
  
  张锦程（1986- ），男，高级工程师，主要从事地质灾害防治研究，E-mail：88659503@qq.com。
  吴焕然（通信作者），男，博士，E-mail：hwucqu@163.com。
- 基金信息：
  
  重庆市规划和自然资源局科研项目(KJ-2021048);重庆英才计划优秀科学家项目(cstc2021ycjh-bgzxm0051);国家自然科学基金(41831282;52108303)
- DOI：10.11835/j.issn.2096-6717.2022.125
  中图分类号： TU441
- 收稿：2022-08-23，
  
  纸质出版：2023-12-25
- 稿件说明：
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张锦程,李俊,肖鹏等.MICP加固砂土方法对比研究[J].土木与环境工程学报,2023,45(06):151-157.

ZHANG Jingcheng,LI Jun,XIAO Peng,et al.Comparative study on MICP-treatment schemes for sands[J].Journal of Civil and Environmental Engineering,2023,45(06):151-157.
张锦程,李俊,肖鹏等.MICP加固砂土方法对比研究[J].土木与环境工程学报,2023,45(06):151-157. DOI： 10.11835/j.issn.2096-6717.2022.125.

ZHANG Jingcheng,LI Jun,XIAO Peng,et al.Comparative study on MICP-treatment schemes for sands[J].Journal of Civil and Environmental Engineering,2023,45(06):151-157. DOI： 10.11835/j.issn.2096-6717.2022.125.

摘要

微生物诱导碳酸钙沉淀（MICP）技术是新兴的岩土工程绿色加固技术，在散粒土加固方面具有良好的应用前景。MICP加固砂土的均匀性和力学表现是目前存在的重要问题，为优化MICP加固方法，改善加固后砂土的综合表现，开展MICP加固砂土方法对比试验研究。详细介绍了传统两相法、pH法及温控法MICP加固方案，利用传统两相法、pH法及温控法开展砂柱试样的MICP加固试验，从加固试样的碳酸钙分布均匀性、反应液中钙离子利用率及加固试样的无侧限抗压强度等3个方面对比分析3种MICP加固方法的综合表现。结果表明：在试验条件下，传统两相法在3方面均表现最差；pH法和温控法整体表现较好，其中温控法反应液利用率较高，在高加固程度时强度略高，综合表现最优。

Abstract

Microbially induced calcium carbonate precipitation (MICP) is a new green ground improvement technique in geotechnical engineering and has a promising prospect in reinforcing granular soils. The uniformity and the mechanical performance of MICP-treated sands are important issues in the MICP method. To optimize the MICP-treatment scheme and improve the overall performance of MICP-treated sands

a comparative experimental study on different MICP-treatment schemes for sands was carried out. Firstly

the MICP-treatment schemes

including the conventional two-phase method

the pH method and the temperature-controlled method

were introduced in detail. Then

a series of MICP-treatment experiments on sand columns were conducted

following the three different schemes

respectively. Finally

the three different schemes were compared in terms of the distribution of CaCO

in the post-treatment specimens

the utilization rate of reaction solutions and the unconfined compressive strength of the post-treatment specimens. Under the testing conditions in this paper

the conventional two-phase method has the worst performance in the three aspects; the pH method and the temperature-controlled method generally perform well; in comparison with the pH method

the temperature-controlled method has a higher utilization rate of reaction solutions and a higher strength under high-treatment conditions; the temperature-controlled method has the best overall performance.

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references

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